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https://bugzilla.mozilla.org/show_bug.cgi?id=814064
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  <meta charset="utf-8">
  <title>Test for Bug 814064</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=814064">Mozilla Bug 814064</a>
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<pre id="test">
<script type="application/javascript">

/** Test for Bug 814064 **/
var xhr = new XMLHttpRequest();
var firings = 0;
function readyStateHandler() {
  is(xhr.readyState, XMLHttpRequest.OPENED, "Should be in OPENED state");
  ++firings;
}
xhr.onreadystatechange = readyStateHandler;
xhr.open("GET", "");
is(firings, 1, "Should have fired the readystatechange handler");
xhr.send();
is(firings, 1, "Should not have fired the readystatechange handler");
xhr.onreadystatechange = null;
xhr.abort();
is(firings, 1, "Should not have fired the handler no-longer-registered handler");
</script>
</pre>
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